SEQUENCE OF OPERATION FOR ALC CONTROL www.addison
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1. SON SEQUENCE OF OPERATION FOR ALC CONTROL AIRSOURCE COOLING ONLY 100 OUTSIDE AIR VERSION 2 0 y E Va 25 www addison hvac com Telephone 1 407 292 4400 SEQUENCE OF OPERATION The ALC controller is turned on by a switch located on its front upper left corner Several options exist for starting the unit such as the Resident Program Scheduler or the Building Automation System These control source options can be selected from the BACview display pad on the Configuration Set Up screen requires Admin password The Resident Program has an adjustable scheduler that uses the internal time clock to allow for separate Sequences for Occupied and Unoccupied periods This can be accessed from the BACview display pad on the Schedules screen requires user password NOTE All temperature related events have an additional delay on make to allow temperatures to settle OCCUPIED MODE When the program control source calls for the start of the Occupied Mode the ALC controller verifies that there are no fault or shutdown conditions a delay timer begins after which the unit goes into Occupied Mode 1 Outdoor Air Damper OD e After the unit goes into Occupied Mode the OA damper will open As the OA damper opens the Outdoor Air Damper Actuator OADA auxiliary switches close 2 Supply Fan SF As the OA damper opens the OADA auxiliary switch adjustable will close and the SF will turn on The SF shall operate2. If OAT cooling and heating set points are selected such that the ranges overlap Alarm logic will reset modified set points to previous value Alarm resets automatically Sec ADDISON 7050 Overland Road Orlando FL 32810 U S A Telephone 1 407 292 4400 Fax 1 407 290 1329 www addison hvac com Installation Code and Quarterly Inspections All installation and service of ADDISON equipment must be performed by a contractor gualified in the installation and service of equipment sold and supplied by Addison and conform to all requirements set forth in the ADDISON manuals and all applicable governmental authorities pertaining to the installation service operation and labeling of the equipment To help facilitate optimum performance and safety Addison recommends that a qualified contractor conduct quarterly inspections of your ADDISON equipment and perform service where necessary using only replacement parts sold and supplied by Addison Further Information Applications engineering and detailed guidance on systems design installation and equipment performance is available through ADDISON representatives Please contact us for any further information you may require including the Installation Operation and Service Manual This product is not for residential use This document is intended to assist licensed professionals in the exercise of their professional judgment 2013 Addison All rights reserved No part of this w
3. Open 0 Short gt 100 c SLT1 Sensor Failure Open 60 2 F 51 2 C Short 296 F 146 7 C d SLT2 Sensor Failure Open 60 2 F 51 2 C Short 296 F 146 7 C e OAT Sensor Failure if no wheel exists Open 60 2 F 51 2 C Short 296 F 146 7 C f OA RH Sensor Failure if no wheel exists Open 0 Short gt 100 g ZAT Sensor Failure Open lt 45 1 F 7 3 C Short gt 98 F 36 7 C h Z RH Sensor Failure Open 0 Short gt 100 7 LAT Sensor Failure Open 60 2 F 51 2 C Short 296 F 146 7 C Unit will automatically shut down 8 High LAT Alarm LAT high limit 120 F 48 9 C adjustable with Electric Heat Alarm resets auto matically 9 High LAT Alarm LAT high limit 130 F 54 4 C adjustable with Gas Furnace Heat Alarm resets automatically 10 Low LAT Alarm LAT low limit 40 F 4 4 C adjustable following 15 minute adjustable delay Unit will automatically shut down 11 Clogged Filter Alarm Clogged filter indicator CFI following 2 minute fixed delay Alarm resets automatically 12 Heat Failure In heating mode and the LAT falls below 50 F 10 0 C adjustable following 15 minute adjustable delay Alarm resets automati cally 13 Smoke Detector Alarm If smoke is detected following 30 second fixed delay Unit will auto matically shut down 14 Set Point Overlap Alarm
4. and HP2 Low Pressure Switch LP1 If LP1 is open after the LP1 by pass time the ALC controller will issue an alarm and compressor 1 turns off After 30 seconds fixed the LP1 alarm will reset Following a minimum time off delay compressor 1 will turn on If the ALC controller records 3 low pressure start restart failure incidents within 1 hour compressor 1 is locked out and the ALC controller will issue an alarm The compressor lock out can be reset in the BACview display pad or by cycling the power of the ALC controller For systems with two compressors this sequence is the same for compressor 2 Y2 and LP2 Safety Shutdown e Smoke Detector When a smoke detector SD is provided it is wired directly to the ALC controller If smoke is detected the ALC controller will shut down the unit The alarm can be reset in the BACview display pad or by cycling the power of the ALC controller If a compressor fails to start 3 times in an hour due to low pressure switch lock out The alarm can be reset in the BACview display pad or by cycling the power of the ALC controller If the SLT drops to 28 F 2 2 C or less for 15 minutes the ALC controller will issue an alarm and compressor stops When the SLT warms back to 50 F 10 0 C or more compressor turns back on If a compressor fails to start 3 times in an hour due to low suction line temperature compressor will be locked out The alarm can be reset in the BACvie
5. is enabled to operate as necessary to maintain the LAT cooling set point When the Z RH is 2 RH adjustable below the Z RH set point the Dehumidification Mode is disabled Digital Compressors The digital compressors run at 100 capacity when there is a call for dehumidification During dehumidification mode if the SLT drops to 38 F 3 3 C or less the digital compressor will modulate from 100 for SLT of 38 F 3 3 C able using the BACview display pad or BAS and operates in cooling mode and dehumidification mode when Reheat is included default is OFF When Reheat is on and the zone air temperature ZAT is above the ZAT cooling set point 72 F 22 2 C adjustable the LAT cooling set point will decrease by a ratio and decrease Reheat modulation or turn off Reheat if On Off control in order to lower the ZAT When the ZAT equals the ZAT cooling set point the unit will go back to normal cooling mode with LAT control When the ZAT is below the ZAT cooling set point the LAT cooling set point will increase by a ratio turn on Reheat if off and increase Reheat modulation if included in order to raise the ZAT When the ZAT equals the ZAT cooling set point the unit will go back to normal cooling mode with LAT control 8 Heating Mode e When the Outside Air Temperature OAT Entering Coil Air Temperature ECAT if wheel exists is 1 F 0 6 C below the OAT ECAT if wheel exists enabli
6. continuously while the unit is in the Occupied Mode When the system reaches the end of the Occupied Mode period the SF will continue to run for an additional 2 minutes before turning off e SF VFD Supply Fan Variable Frequency Drive The SF VFD will modulate its speed based upon the differential pressure transmitter SF DPT signal to maintain the supply duct static pressure set point For contact air volume CAV select Manual Override in the BACview keypad and input the required speed Hz per field test and balance 3 Exhaust Fan EF e Atthe same time the SF turns on the EF if included will turn on e The EF shall operate continuously while the unit is in the Occupied Mode When the system reaches the end of the Occupied Mode period the EF will continue to run for an additional 2 minutes before turning off e EF VFD Exhaust Fan Variable Frequency Drive e The EF VFD will modulate its speed based upon the differential pressure transmitter EF DPT Signal to maintain the building static pressure set point For contact air volume CAV select Manual Over ride in the BACview keypad and put the required speed Hz per field test and balance 4 Energy Conservation Wheel ECW As the OA damper opens the OADA auxiliary switch fixed closes which enables the Johnson Controls C450 controller At this point the wheel operates as an independently controlled component A separate OAT and RAT sen
7. et point e When the LAT is 2 F 1 1 C adjustable above the LAT cooling set point HGRH turns off e Hot Gas Reheat HGRH Modulating e When the LAT is below the LAT cooling set point Reheat turns on and modulates to maintain the LAT cooling set point e When the LAT is 2 F 1 1 C adjustable above the LAT cooling set point HGRH turns off 7 Room Temperature Reheat Override RTRHO Optional cycles to maintain the LAT set point e When the LAT is 2 F 1 1 C adjustable above the LAT cooling set point HGRH turns off Room Temperature Reheat Override mode is select Hot Gas Reheat HGRH Modulating e When the leaving air temperature is 1 F 0 6 C adjustable below the LAT cooling set point Reheat turns on and modulates to maintain the LAT cooling set point e When the LAT is 2 F 1 1 C adjustable above the LAT cooling set point Reheat turns off 6 Dehumidification Mode When OAT ECAT if wheel exists is more than 60 F 15 6 C and the zone relative humidity Z RH is 1 RH above the Z RH set point 55 RH adjustable and there is no call for heating Dehumidification Mode is enabled After the minimum time off delay compressor 1 turns on For systems with two compressors when the Z RH is 2 RH adjustable above the Z RH set point after the minimum time off delay compressor 2 turns on Both compressors will respond in sequence and run at full cooling Reheat
8. ng heating set point 55 F 12 8 C adjustable heating is enabled and modulates to maintain LAT heating set point 72 F 22 2 C adjustable e When the OAT ECAT if wheel exists is 1 F 0 6 C adjustable above the OAT ECAT if wheel exists enabling heating set point heating is disabled Staged Heat Electric Heat or Gas Furnace e 2 Stage Heat Terminal W1 turning on enables first stage heating As the LAT goes further below the LAT heating set point terminal W2 energizes and second stage heating is enabled As the LAT rises second stage heating turns off As the LAT goes above the LAT heating set point terminal W1 turns off and first stage heating turns off e 4 Stage Heat Terminal W1 turning on enables the heating analog relay module HARM on the control panel which activates the different stages of heating As the LAT goes further below the LAT heating set point the different stages will turn on As the LAT goes further above the LAT heating set point the different stages will turn off Modulating Heat e SCR Electric Heat On demand for heating the electric heating SCR will modulate in order to maintain the LAT heating set point e Modulating Gas Heat On demand for heating the gas furnace controller will modulate to control the gas flow in order to maintain the LAT heating set point Room Temperature Heating Override Optional Room Temperature Heating Override mode is selectable usi
9. ng the BACview display pad or BAS and operates in heating mode when included default is OFF e When the zone air temperature ZAT is 2 F 1 1 C adjustable below the ZAT heating set point the LAT heating set point will increase by a ratio and increase heat modulation in order to raise the ZAT When the ZAT is equal to or more than the ZAT heating set point the unit will go back to normal heating operation e When the ZAT is 2 F 1 1 C adjustable above the ZAT heating set point the LAT heating set point will decrease by a ratio and decrease heat modulation in order to lower the ZAT When the ZAT is equal to or less than the ZAT heating set point the unit will go back to normal heating operation UNOCCUPIED MODE When the system has reached the end of its Occupied Mode the compressor s and outdoor fan s subject to minimum run time or heating system will turn off The SF and EF if existing will continue to run for 2 minutes before turning off After this the Wheel if existing will turn off and the OA damper will close Unit is now off Safety Switches e High Pressure Switch HP If HP1 is open the ALC controller will issue an alarm and compressor 1 is turned off and locked out After resetting HP1 the compressor lock out can be reset in the BACview display pad or by cycling the power of the ALC controller e For systems with two compressors this sequence is the same for compressor 2 Y2
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11. s a 4 minute minimum run time and a 5 minute minimum time off delay e Digital Compressors e When unit has hot gas Reheat the digital compres sors will modulate load and unload based on the suction line temperature SLT set point 45 F 7 2 C adjustable e When unit has no hot gas Reheat the digital compressor will modulate load and unload based on the leaving air temperature LAT cooling set point If the SLT drops to 32 F 0 0 C or less the digital compressor will run fixed at 10 e For systems with two digital compressors when there is a call for 1st stage cooling 2nd stage cooling will also be enabled 10 seconds later Both compressors will modulate to maintain the set point For systems with two compressors if there is a current call for 1st stage cooling and compressor 1 is shut down due to an alarm HP1 LP1 or SLT1 compressor 2 will be turned on to take its place until it returns e Hot Gas Reheat HGRH On Off e When the LAT is 1 F 0 6 C adjustable below the LAT cooling set point Reheat turns on and down to 10 for SLT of 32 F 0 0 C Operation at 32 F 0 0 C or less will be the same as during normal cooling mode operation e For systems with two digital compressors both compressors will turn on and run at 100 capacity e Hot Gas Reheat HGRH On Off e When the LAT is below the LAT cooling set point Reheat turns on and cycles to maintain the LAT s
12. sors are wired directly to the Johnson Control C450 e Wheel Standard Operation e When the OAT is above or below an adjustable differential 3 F 1 7 C of the return air tempera ture RAT the Wheel will be on otherwise it is off e Wheel with On Off Defrost e When the OAT is above or below an adjustable differentia 3 F 1 7 C of the return air tempera ture RAT the Wheel will be on It will be off if the OAT is within the differential range or below an adjustable set point to allow for wheel defrosting default is 15 F 9 4 C e Wheel with VFD Controlled Defrost WM VFD e When the OAT is above or below an adjustable differential 3 F 1 7 C of the return air tempera ture RAT the Wheel will be on It will slow its speed or stop if the OAT is below an adjustable set point to allow for defrosting default is 15 F 9 4 C It will be off if the OAT is within the RAT differential range 5 Cooling Mode e When the Outdoor Air Temperature OAT Entering Coil Air Temperature ECAT if wheel exists is above the leaving air temperature LAT cooling set point 72 F 22 2 C adjustable compressor 1 turns on When OAT ECAT if wheel exist is 1 below the LAT set point cooling modes is off For systems with two compressors when the LAT is above the LAT cooling set point plus an adjustable differential 2 F 1 1 C compressor 2 turns on e Compressor enabling logic include
13. w display pad or by cycling the power of the ALC controller If the ALC controller detects an LAT sensor failure The alarm can be reset in the BACview display pad or by cycling the power of the ALC controller Standard Alarms alarms require reset in the BACview or cycling the power of the ALC controller unless noted 1 Supply Fan Alarm If the SF fails to start and the SF APS air proving switch does not confirm air flow to ALC following 60 second adjustable delay Unit will automatically shut down 2 Exhaust Fan Alarm If the EF fails to start and the EF APS air proving switch does not confirm air flow to ALC following 60 second adjustable delay 3 Compressor 1 2 Fault Compressor stops due to HP1 HP2 open following 30 second fixed delay Requires HP1 HP2 manual reset 4 Low Pressure Switch 1 2 Alarm Compressor stops due to LP1 LP2 open following 90 second adjustable delay Compressor lock out occurs if alarm happens 3 times in 1 hour Low Pressure Switch 1 2 STOP 5 SLT 1 2 Alarm Compressor stops due to SLT1 SLT2 freeze condition following 15 minute adjust able delay Compressor lock out occurs if alarm happens 3 times in 1 hour SLT 1 2 STOP 6 Sensors readings exceeding limits following 2 minute fixed delay Alarms reset automatically a ECAT Sensor Failure if wheel exists Open 60 2 F 51 2 C Short 296 F 146 7 C b EC RH Sensor Failure if wheel exists
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